Paper 2021/1483
A Practical Forward-Secure DualRing
Nan Li, Yingjiu Li, Atsuko Miyaji, Yangguang Tian, and Tsz Hon Yuen
Abstract
Ring signature allows a signer to generate a signature on behalf of a set of public keys, while a verifier can verify the signature without identifying who the actual signer is. In Crypto 2021, Yuen et al. proposed a new type of ring signature scheme called DualRing. However, it lacks forward security. The security of DualRing cannot be guaranteed if the signer's secret key is compromised. In this work, we introduce forward-secure DualRing. The singer can periodically update his secret key using our proposed ``split-and-combine" method to mitigate the security risks caused by the leakage of secret keys. We present a practical scheme based on the discrete logarithm assumption. We show a detailed evaluation to validate its practicality.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- DualRingForward SecurityPractical Scheme
- Contact author(s)
- sunshine tian86 @ gmail com
- History
- 2021-11-08: received
- Short URL
- https://ia.cr/2021/1483
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2021/1483,
author = {Nan Li and Yingjiu Li and Atsuko Miyaji and Yangguang Tian and Tsz Hon Yuen},
title = {A Practical Forward-Secure {DualRing}},
howpublished = {Cryptology {ePrint} Archive, Paper 2021/1483},
year = {2021},
url = {https://eprint.iacr.org/2021/1483}
}
